spitter

/ˈspɪtər/
noun
  1. A person who spits (forces saliva from the mouth), especially habitually or in public.
    • In some cultures, a spitter is seen as very disrespectful.
    • The coach warned the player not to be a spitter on the field.
    • The bus driver asked the spitter to leave the bus because of his rude behavior.
  2. In baseball, a pitch that is illegally wet with saliva or another substance, making it move unpredictably.
    • That pitch had too much movement — it looked like a spitter.
    • Umpires check the ball carefully to prevent the use of a spitter.
    • The pitcher was ejected from the game for throwing a spitter.